Renewable cutting-tooth point



w. L". EDMONDSUN. Y RENEwABLE CUTTING TooTH POINTl I APPI-.ICATION FILEDJULY 29.1919.'

1,340,385. y Patented MayI8,192It).

'2 SHEETS-SHEET 2.

will/l l 1m' im I w l: A

WARREN L. EDMON'DSON, OF WASHINGTON, DISTRICT OF COLUMBIA.

RENEWABLE CUTTING-TOOTH POINT. i

Specification of Letters Patent.- A Patented lay 1S, 19.20.

Application filed .Tuly 29; 1919. Serial No. 313,978.

To all whom it may concern:

Be it known that I, lVARRnN L. EDMOND- SON, a citizen of the UnitedStates, residing at lVashington, in the District of Columbia, haveinvented certain newand useful lmprovements in Renewable Cutting-ToothPoints, of which the following is a specification.

This .invention relates to new and useful improvements in renewablecutting tooth points, and pertains more particularly to cutting pointsfor use with ditching and grading machines and the like. i

The primary object of the invention is to provide a tooth which has anovel vform of detachable cutting point so lthat the vlatter may beeasily and quickly removed when worn or otherwise incapacitated, and anew point inserted in its place. f

The invention further aims to provide `a point which involves a minimumof material, so that upon discarding thereof the resultant waste isreduced to the least possible, and at the same time to thus economize inthe 'initial course of. production.

The invention further aims to provide a connection between the point'and thev shank of the tooth which will eifectivelysupport the point andallow its disconnection and the connection of a new point, and whichwill also support the point so that the stresses imposed there upon willbe assumed by the parts without likelihood of breakage.

Further and other 4objects will be later set forth and manifested in thecourse of the following specification.

In the drawings: y

Figure l, is a vertical sectional view taken through a bucket andshowing the present invention applied to the bottom and a side of thecutting bar thereof.

Fig. 2, is an enlarged view of the bottom tooth in longitudinal section.Fig. 3, isa bottomplan view of Fig. 2.

Fig. 4, is a top plan view of the shank with the point removed.

Fig. 5, is a front 'end elevation of Fig. 4.

Fig. 6, is a side elevation of the cutting point. Y

Fig. 7, is a rear end elevation of Fig. 6.

Fig. 8. is an enlarged section on the line S-S of'Fig. 1.

Fig. 9, is atop plan view of the side tooth of Fig. 8 and,

Fig 10, is a section in a line 10-10 of Fig. 9. y

The invention is shown applied to a bucket B, having the usualsubstantially U-shaped cutting' blade Cat its front edge, and involves ashank il, which is secured to the cutter bar by means of bolts and nuts2.

The forward portion' of., the shankkis .pro-

vided with a socket-like part 3,-.o`fisomewhat V-form so as toiwedgingly receiveV the cutting edge of the cutter bar C, as depicted inthe drawings. The shank at-its` eXtreme frontend is formed to have anupper inclined face `4p, and rearwardly. and downwardly inclinedparts 5,the parts 4 and 5,

conj ointly f-ormilngasomewhat V-shape con-.

figuration-The inclined end face 4, is

V'formed with a .dovetail groove 6, centrally between itssides, and witha preferably slightly inclined shoulder 7, at the lower end of thegroove, which shoulder is formed so as to provide a fiat abutting wallfor a purpose laterset forth. This shoulder 7j, is at substantiallylright angles to the longitudinal axis of the shank so as to have maximumresistive property as will be now described.

The removable cuttingpoint includes a body hai/ing an inclined upperface 8 and av fiat bottom 9, the two conjointly forming a somewhatV-shaped configuration, with the rear end of the face 8, extendingbeyondthe inner end of the bottom 9. A dovetail projection or tenon 10, isformed on the rear of the inclined part 8, and at its lower end isextended and enlarged and provided with a depending foot 11, the lattershaped and formed so as'to abut the shoulder 7, while the inclined parts-5 ofthe shank 1 are engaged with downwardly and rearwardly inclinedparts 12-12, Shaped to form a close' or tight fitting joint with saidinclined parts 5. The parts 19., 12, aredisposed on opposite sides ofthe foot 11,|and -are of greater length than the latter and of greaterinclination than the foot extending beyond the rear of the latter. Thetenon actsto reinforce the cutting point, while the foot 11, functionst'o also reinforce the bottom part 9 of the point. The foot l] is thusbacked by a conabutting the shoulder 7 the latter will, due to itsvertical dispositien assume all longitudinal thrusts or stresses towhich the point is inherently subjected in the per? applied to thebottom of the cutterv bar, so

that the point will extend outwardly of the outer face 14 of shank'l asdepicted in Fig. 8 of the drawings, the face lll'of. shank l beingcurved so asto merge into; the outer' face 9 of the point.

l larity differing from that of the shoulder,

clined In both forms ofthe invention, the point and the shank are formed.with registering openings through which a rivet l5 is passed, the rivetbeing inclined and having its ends headed and countersunk into the pointand shank as shown.,` This rivet functions to prevent disengagementofthepoint. from the shank by sliding of the point, and is not subjected toany of the stresses or strains imposed upon the'point during working ofthe latter. ther noted the opening in the point for the reception of therivet 15 extends through the dove-'tail projection 10, so that the pointis not appreciably weakened.

It will be apparent' from the foregoing that all thrusts imposed uponthe point end- Awise thereof willy be taken up not only by the centralshoulder 7 but also by the inarts 5l which are disposedone on each si ofthe shoulder and have an anguthe latter and-the parts 5-5 ybeing engaged4-loy the foot 11 and thelparts'12-12 respec- 'tively In additionlateralthrusts or strains imposed upon the point will be taken up in part bythe dove-tail tenon 10.

AIt will further'be seen from the foregoing that thedtooth as well vasthe shank are devoid of any frail or weak portions which are likely tobecome broken or fractured or otherwise rendered unserviceable in use.

By referring to Fig. 1. it will be seen that the joint formed betweenthe parts z'. e. point and shank, extend intothe point so that thelatter is provided with an upper part of equal thickness, and withcorresponding strength. Further the wall 12- is short so as to require aminimum of material `in the manufacture of the point, and consequentlylthe point can' be used down to the part marked X in Fig. l, so that upondiscard of the point the least wasted. What is claimed is 1. In a ytoothfor ditching machines and the like, a shank .having a downwardly andAoutwardly inclined upper face formed with In this regard it will be fur'possible material is the tenon and beyondthe outer face thereof adovetail groove centrally between its sides and formed withdownwardlyand rearwardly inclined parts on opposite sides of the groovewith a shoulder at and extendinfr across the lower end of the groove,said shoulder being substantially at right angles -to the longitudinalaxis of the shank, a removable cutting. point having a bottom wall,

an inclined front fa'ce, and a dovetail prothe like a shank having asubstantiallyV V-shaped endfformed with a groove, said groove forming atransversely central shoul` vto der at the lower end thereof whichshoulder is substantially 'at right angles to the longia tenon receivedin the groove and having a '3. I n a tooth for ditching 'machines andthev like,v a shank having a substantially vV-shaped end formed with agroove which .latter extends throughthe upper .face and the apex of theV-end so as to form an abrupt shoulder at the apex and a cutting pointhaving a tenonon its rear received in said groove, said tenon beingextended.v

downwardly and enlarged at its lower end and formed with a foot to abutthe Vshoulsides of the foot' to engage the lower face of the V-end .ofthe. shank, said'parts being oil greater length than the foot andextendin ,toward the cutting point of theft'eeth an l rearwardly beyondthe rear end of the vfoot;

4. In a tooth .for Yditching machines and the like, a -shank having a`groove andan abrupt shoulder at the base of the groove,

and depending therefrom, anda cuttingv der and havingl a pair ofparts onopposite point ofthe same width as lthat of the shank' seated on thelatter and having a tenon on its under face receivable in the groove andhaving a footextending outwardly from to engage the `shoulder-.

5. VIn a tooth for'ditching machines and the like, a shank having agroove arranged at al1-incline tothe shank and ashoulder at the. base ofthe groove, cutting point havment on the tenon at the bottom end thereofing downwardly and rearwardly extending between saidparts, saidenlargement being side prts underlapping the bottom oftheshapedtoconformably engagesaid shoulder 10 groove, and abutting the endparts of the and having a different inclination from that 5 -shank on.opposite sides of the groove, a. of the said end parts of the cuttingpoint.

tenon on the rear face of the point extending l In testimony whereof-Iaiiix my signature. upwardly from 'said parts, and an eniarge- WARRENL.'EDMONDSON.

